package com.jingbaoduo.filter;

import com.alibaba.fastjson.JSON;
import com.jingbaoduo.common.BaseContext;
import com.jingbaoduo.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "loginCheckFilter",urlPatterns =  "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        log.info("进入过滤器");

//1.获取本次请求的url
        String requestURI = request.getRequestURI();

        log.info("拦截到请求:{}",requestURI);
        //定义不需要请求的路径
        String[] urls = new String[] {
                "/employee/login",
                "/employee/logout",
                "/user/sendMsg",
                "/user/login",
                "/user/logout",
                "/alipay/notify"
        };
        //2.判断本次请求是否需要处理
        boolean check = check(urls, requestURI);

        //3.如果不需要处理直接放行
        if (check){
            log.info("本次请求{}不需要处理",requestURI);
            filterChain.doFilter(request,response);
            return;
        }

        //4.判断登录状态,如果已经登录,则直接放行
        if (request.getSession().getAttribute("employee") != null){
            log.info("用户已登录,用户的id是:{}",request.getSession().getAttribute("employee"));


            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);
            filterChain.doFilter(request,response);
            return;
        }

        //判断用户登录状态,若果已经登录,则放行
        if (request.getSession().getAttribute("user") != null){
            log.info("用户已登录,用户的id是:{}",request.getSession().getAttribute("user"));
            long userId = (long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);
            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //5.如果未登录则返回未登录结果,通过输出流方式向客户端页面响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));

        return;


    }

    /**
     * 路径匹配,检查本次请求是否需要放行
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }

}
